List of top Physics Questions

The work function of a metal is \( 2.5 \times 10^{-9} \) joule. If the metal is exposed to a light beam of frequency \( 6.0 \times 10^{14} \) Hz, what will be the stopping potential?
In a transistor:
Define optical centre of a lens.
Write the minimum orbital angular momentum of the electron in a hydrogen atom.
How much energy is released in mass defect of 1 amu?
As compared to \(^{12}_6C\) atom, how many extra protons and neutrons does the \(^{14}_6C\) atom have?
The electric field of intensity \( \vec{E} = (3 \hat{i} + 4 \hat{j}) \, \text{N/C} \) passes through the plane of area \( \vec{A} = (10 \hat{i}) \, \text{m}^2 \). Find the electric flux.
The net resistance of an ammeter should be small to ensure that:
What do you understand by electromagnetic induction? State Faraday’s laws regarding electromagnetic induction.
What is LED? Explain its principle, construction and working.
As the temperature of a metal and of a semiconductor is increased, the:
What is the meaning of wavefront? Explain the laws of reflection by explaining Huygens' principle of wavefront.
Draw the energy level diagram for hydrogen atom. Show the transitions of Lyman, Balmer, Paschen, Brackett and Pfund series in the diagram. In which region do these spectrum lie?
The equivalent resistance of the network shown in figure between A and B is:
The equation \( E = pc \), where \( E \), \( p \), and \( c \) represent energy, momentum, and velocity of light, is valid:
What is the meaning of matter-wave of Louis de Broglie? Deduce the relation for wavelength of de Broglie in terms of kinetic energy.
Obtain the formula for refractive index of material of prism in terms of angle of minimum deviation and angle of prism.
Explain both the laws of Kirchhoff of electrical circuits.
Derive the formula for the capacitance of a parallel plate capacitor, partially filled with a dielectric.
What is a transistor? By drawing the circuit diagram of common emitter configuration, plot the output characteristics.
Explain Bohr's model of the atom.
Define the formula for the resonant frequency in a series L-C-R alternating current circuit.
The energy of an electron of excited hydrogen atom is -3.4 eV. Determine the angular momentum of the electron.
Equiconcave lens of crown glass has to be made. How much radii of the surfaces of the lens should be kept so that its power would be -2.5 D? The refractive index of crown glass is 1.65.
On suspending a magnet at 30° with the magnetic meridian, it makes an angle of 45° with the horizontal. What will be the actual angle of dip?